Black & Decker Lithium Ion Charger *Battery Chemistry: Lithium-Ion *Product Type: Battery Charger *Voltage: 20 volts *Charge Time: 60 min *Energy Star Compliant: Yes *UL Listed: Yes *Battery Charged Indicator: Yes *Feature 2: Allows you tocharge 12 volt-20 volt lithium slide pack batteries *Feature 1: Fast charger recharges 1.5 Ah lithium slide pack batteries in 45 minutes or less *Feature 3: Maintenance mode charging automatically optimizes charging for longer battery life*Charges all Black & Decker 16V Max and 20V Max batteries including 4.0ah 20V batteries * Maintenance mode automatically optimizes charging for longer battery life *  Backed by 2 year limited warranty